import javax.xml.soap.Node;
import java.lang.reflect.Array;
import java.util.*;

class LRUCache<K, V> extends LinkedHashMap<K, V> {
    private static final int MAX_ENTRIES = 3;

    protected boolean removeEldestEntry(Map.Entry eldest){
        return size() > MAX_ENTRIES;
    }

    LRUCache(){
        super(MAX_ENTRIES, 0.75f, true);
    }
}

public class StringOperation {
    public static void main(String[] args)
    {
        HashMap<Integer, Integer> map = new HashMap<>();
        String s = "";
        char a = '5';
        char b = (char)(a + 4);
        s += b;
        StringBuffer str = new StringBuffer();
        str.append(4);
        str.append("fasdf");
        str.append(34.33);
        System.out.println(s);
    }
}
